fix(NODE-3760): Add regex check to 12 length string in isValid

[MrEmanuel]

Issue with description filed here.
https://jira.mongodb.org/browse/DRIVERS-1989

Description

Check the validity of strings with length 12 in the same way as is done for 24 length strings.

What is changing?

Added regex check to 12 length strings in ObjectId.isValid()

Is there new documentation needed for these changes?

No.

What is the motivation for this change?

Object.isValid() returns true for strings that it shoudn't. For example the string: ´Value with é`

Double check the following

• Ran npm run lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: <type>(NODE-xxxx)<!>: <description>
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[dariakp]

@MrEmanuel Hi there, thank you for reaching out about this issue. We moved the ticket you created to the NODE driver project, you can follow it here: https://jira.mongodb.org/browse/NODE-3760. It looks like we missed a validation case in our most recent ObjectId constructor validation improvement, so we'll look into adding it there as well as adding corresponding logic to isValid().

[nbbeeken]

Resolved in #475